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HDS soft-down stay medium-duty left is a Sugatsune America lid support from the HDS-30 series that is designed for an upward-opening flap door, so it controls the door movement in open and close positions for consistent operation. This soft down stay works with flap doors using piano, butt, or concealed hinges, which lets you match it with common hinge layouts on work surfaces, cabinets, or similar installations. The stay is used in pairs, so each door uses two units working together to share the load evenly across the flap width. The HDS-30 design securely latches a flap closed and also holds it in the fully opened position, which keeps the door stable while in use and reduces uncontrolled movement. The unit is a medium duty version in black plastic and steel, giving a combination of structural metal with a black exterior appearance.
This medium duty soft down stay uses a torque-based selection method, defined as Torque = Door Height x 1/2 x Door Weight, so the installer can size the stay pair for the flap by working from door dimensions and weight. The HDS-30 series uses K-Type torque ranges of 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, M-Type torque ranges of 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair, and H-Type torque ranges of 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair, which sets clear performance brackets for different door loads. This left-hand black plastic and steel stay fits within that HDS-30 torque framework, so it can be matched to a flap that falls in the medium duty window when calculated.
This Sugatsune lid support is described for an upward-opening flap door, so it is suited to doors that pivot from the top edge and swing up into an open position. By working with piano, butt, or concealed hinges, the stay integrates with continuous hinges, traditional butt hinges, or modern concealed hinge layouts, which gives flexibility in how the flap is hung while the stay handles controlled motion. Within work surface and tables or similar cabinetry, the combination of hinge and HDS soft-down stay medium-duty left allows the flap to open upward and then remain fully open, so the user has hands-free access to the space behind or below the flap. When the flap is brought down, the soft-down function of the HDS-30 series manages the closing action at the torque range appropriate to the calculated door load, helping the flap settle into its closed, latched position.
The HDS-30 torque calculation of Torque = Door Height x 1/2 x Door Weight directly links door geometry and mass to the stay selection, so installers can align the flap design with the torque brackets. The K-Type torque range of 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, the M-Type torque range of 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair, and the H-Type torque range of 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair define how much moment the pair of stays is intended to handle. The medium duty HDS soft-down stay medium-duty left operates in the context of those ranges, so a flap door sized into the appropriate band will be supported and controlled according to the HDS-30 design. By matching the flap door to the torque window, the stay can latch the flap closed and hold it fully open as specified, which supports predictable motion and helps maintain consistent alignment in regular operation.
This soft down stay is designed for an upward-opening flap door, so it supports doors that swing up and then are held in the fully opened position.
The HDS-30 torque is calculated as Torque = Door Height x 1/2 x Door Weight, linking the flap's size and weight directly to stay selection.
The HDS-30 system covers K-Type 140-200 kgf.cm (121-173 lbs. inch), M-Type 200-250 kgf.cm (173-216 lbs. inch), and H-Type 250-300 kgf.cm (216-260 lbs. inch) per pair.
This lid support is described for use with piano, butt, or concealed hinges, so it can be applied alongside those hinge types on flap doors.
The HDS-30 soft down stay is used in pairs, so each upward-opening flap door uses two stays working together.
The HDS-30 is designed to securely latch a flap closed and hold it in the fully opened position, giving clear end positions.
The HDS-30ML/BLK soft down stay from Sugatsune America offers a medium duty left-hand option for upward-opening flap doors that need defined open and closed positions. By using the torque formula Torque = Door Height x 1/2 x Door Weight and the K-Type, M-Type, and H-Type torque ranges, the stay pair can be matched to a flap that fits within the HDS-30 system. For projects using piano, butt, or concealed hinges on flap doors, this black plastic and steel lid support gives a way to add soft-down behavior and stable holding in the fully opened position. Select this HDS soft-down stay medium-duty left when you want an HDS-30 series component sized by torque for flap doors in the medium duty range.